The Real Odds of a Cascadia Megaquake in the Next 50 Years

The U.S. Geological Survey puts the chance of another magnitude 9 earthquake on the Cascadia coast in the next 50 years at 10 to 15 percent - about 1 in 7 at the top. Where does that number come from, and what would the first minutes look like? We follow the real records - the USGS 2025 fact sheet, a tsunami that hit Japan in January 1700, tree rings and buried marsh soil, Oregon's 2013 resilience plan and new University of Washington seafloor data - to separate what is measured, what is modeled and what nobody knows. Chapters 0:00 The orphan wave 0:59 Two answers: 10 or 15 percent 2:14 Clues in the ghost forests 3:25 The night of January 26, 1700 4:49 Nineteen great earthquakes 5:29 Is the fault locked right now? 6:10 What the viral videos got wrong 6:41 The first minutes 8:08 The real odds Real photos and footage from the original sources are used wherever they exist. Scenes that no camera recorded are AI-made illustrations, and every fact in this video is checked against official USGS, University of Washington and Oregon state records and published research papers before release. Spot something wrong? Tell us in the comments. We chose this story, checked every fact against the sources below and watched it before it went out. AI tools helped us make it. Deep Planet is made by Cosmic Drive Studios, a small independent studio that gets better with every video. If you enjoyed this, subscribing genuinely helps us make the next one. Music: YouTube Audio Library. RESEARCH & SOURCES (official numbers: USGS Fact Sheet 2025-3050, version 1.1, 30 Sep 2025; 9 sources): USGS Fact Sheet 2025-3050 Ver 1.1 Earthquake Probabilities and Hazards in the U.S. Pacific Northwest (30 Sep 2025). https://pubs.usgs.gov/fs/2025/3050/fs... Atwater B.F. Musumi-Rokkaku S. Satake K. Tsuji Y. Ueda K. Yamaguchi D.K. The Orphan Tsunami of 1700 USGS Professional Paper 1707 (2005; 2nd ed. 2015). https://pubs.usgs.gov/publication/pp1707 Satake K. Wang K. Atwater B.F. Fault slip and seismic moment of the 1700 Cascadia earthquake inferred from Japanese tsunami descriptions. JGR Solid Earth (2003). https://doi.org/10.1029/2003JB002521 Goldfinger C. Nelson C.H. Morey A.E. and others. Turbidite Event History - Methods and Implications for Holocene Paleoseismicity of the Cascadia Subduction Zone. USGS PP 1661-F (2012). https://pubs.usgs.gov/publication/pp1... Kidiwela M. Denolle M. Wilcock W. Feng K.-F. and others. Active protothrusts and fluid highways: Seismic noise reveals hidden subduction dynamics in Cascadia. Science Advances (2026). https://doi.org/10.1126/sciadv.aea3684 University of Washington News 27 Feb 2026 Stress-testing the Cascadia subduction zone reveals variability that could impact how earthquakes spread. https://www.washington.edu/news/2026/... Oregon Seismic Safety Policy Advisory Commission. The Oregon Resilience Plan Executive Summary (Feb 2013). https://www.oregon.gov/dogami/tsuclea... Gabel L.L.S. O'Brien F. Allan J.C. DOGAMI Open-File Report O-20-09 GIS data and method for determining maximum-considered local and distant tsunami wave arrival data for the Oregon coast. https://pubs.oregon.gov/dogami/ofr/p-... USGS ComCat events us6000ty27 us6000ty2u us6000ty43 (28 Sep 2026). https://earthquake.usgs.gov/fdsnws/ev... CREDITS (photos, footage and documents): "Drone Flight Cape Kiwanda Pacific City Oregon" by Aerial Northwest (CC BY 3.0) "Destination Oregon Coast Cinematic Drones" by BrockLeeFPV (CC BY 3.0) "Past a skerry off Garibaldi Oregon" by dino (CC BY-SA 4.0) "Astoria-Megler Bridge crossing by car" by Steven Pavlov (CC BY-SA 4.0) "Interstate 5 in Seattle 113826" by Steven Pavlov (CC BY-SA 4.0) "Neskowin Ghost Forest 2016" by RocketSams (CC BY-SA 4.0) "Neskowin Ghost Forest August 2017" by Chrahp (CC BY-SA 4.0) "Seattle Cadillac Hotel Nisqually 2001" by Erik Stuhaug, Seattle Municipal Archives (CC BY 2.0) "Sea stack Sisters Rocks Oregon" by Z3lvs (CC0) Public domain or U.S. government works: USGS (including figures and photos from USGS Fact Sheet 2025-3050 and Professional Paper 1707; ghost-forest photo by Brian Atwater, USGS), BLM Oregon and Washington, GOES imagery (CSU/CIRA and NOAA), Michael Theberge, M.O. Stevens. Photos and footage above: Wikimedia Commons (commons.wikimedia.org), titles as listed. Licences: CC BY 3.0 creativecommons.org/licenses/by/3.0 | CC BY 2.0 creativecommons.org/licenses/by/2.0 | CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0 | CC0 creativecommons.org/publicdomain/zero/1.0 #Cascadia #Megaquake #Earthquake